# Search results

1. ### Which high voltage is more dangerous: AC, or DC, and why?

I wish I had a plot of voltage on the X-axis and danger level on the Y-axis for AC and DC. I was talking to an engineer at work, he was telling me that DC is more dangerous at high voltage. I said I disagreed with him but did not do into detail as to why I thought so. I did say that I've...

Thanks.
3. ### Simple statics question

Okay, so I am trying to understand the method of sections so I can finish my homework. I look at http://en.wikibooks.org/wiki/Statics/Method_of_Sections" [Broken] and for the life of me, I can't understand why at the bottom of the page it says Fy=0=2T2 - 981 . Where does the factor of 2...
4. ### Portland geeks

Its been a while since I've been on here. I moved to the Portland area, and was wondering if there was any more people from this forum in or around Portland? Oh yeah- I'm geeky again now... I'm just looking to see if any PF members want to hang out some time. Should I look in another...
5. ### Water car video

Hello everyone, long time no see :) I hope this would be the correct forum to post in .. I haven't been here in a while so I don't know if this topic has already (probably surly has) been discussed. What does the chemists, physicist or engineers think about his video...
6. ### Mathematics of this optical illusion

okay so the people who swap have a similar slice missing? Yes, I failed to see what this has to do with math also. Hence my question. What it does have to do with math, I was having a difficult time comprehending. So I wanted to get a quantitative analysis as to what was actuaclly...
7. ### Mathematics of this optical illusion

I figured out what happened on the first post... when I made it a hyper link, I thought I had screwed because the url was there twice. It was actually there for the hyperlink text. So I still had the hyperlink there (as I found out when I edited my post) , but there was no hyperlink text so...
8. ### Mathematics of this optical illusion

Maybe I will get it eventually, but I"M STILL TRIPPIN! on this one. It is very clever. I'm just still having a difficult time visualising the appearance / dissapearence ot the extra person!:grumpy: :yuck: :cry: :uhh:
9. ### Lamba point He fountain

somebody?? anybody? c'mon, its been almost 2 years!
10. ### Mathematics of this optical illusion

my bad! my original post had this link, but the site was having problems and i scuffed my post up upon redsoig it. I understand the triangle problem. the illusion that was bother me was this one: http://www.ebaumsworld.com/images/illusioncount.gif" [Broken] I was thinking it might work...
11. ### Mathematics of this optical illusion

yah, there was i a much better example i remember, but maybe I'm just imagining that? Maybe it was just a long time ago and it was impressive back then. I'm still stumped by this people illusion as of now.
12. ### Mathematics of this optical illusion

Hello everbody, long time no see! I hope this is the right forum for this, I'm not ready to post it in the topology forum:cry: Okay, so I saw this neat optical illusion. It really started to bug me as I was playing around with it in paint trying to figure it out...

It sounds like your specified operating system is working exzctly as it was made to ( yes I use windows also )
14. ### I have a questian

the go to guy: If you're really serious about making this train for a science project, why not do something easier this year, and have the train be an early start on a project for next year?
15. ### Make it a little harder to find personal set up

Also, note that there is a link in the email which allows you to unsubscribe from all threads. Hard to click, but the results are astouning:wink:
16. ### Irrational numbers vs. Transcendental numbers

Isn't that also (indirectly) stating that trancendental numbers appear in their own definition?
17. ### Gas Law Problems

I think these can all be solved using the ideal gas law, pv=nrt Since you didn't ask specificly for direction and have shown no work, this is about the most help you can expect to get here. Hint: and the answer is in another problem:
18. ### Latus rectum conics math help

Draw an ellipse, show the relationships of A and B, do a little trig...
19. ### Red Hot Magnetics

What happens is, before the curie temperature is reached, you smash your hand between the two plates like a crepe
20. ### PF Member Photo Thread Archive

Great! No one even needed to make fun of my photos
21. ### Southern California Is On Fire

Been watching the last 5 days. This weekend is crazy, and there's so much smoke you can hardly see them at night. We need rain bad!
22. ### Center of Mass

Oops, I missed the part about the corner cut out... I guess its back to x_bar y_bar in the first place then... Well, it could still be done the way I was suggesting, don't know if its any easier though...but the point was to take out all area symmetrical about both axis, to simplify the...
23. ### The Foolishness

So its in the water , eh?
24. ### Ginger tea!

I like ginger beer ( REAL ginger ale) ... but the best drink I can think of is Hemp Seed Milk - yum!
25. ### How did you get into Physics?

I guess you can say I was forced...physically
26. ### PF Member Photo Thread Archive

Lol, here's a funny picture from this summer http://heavenly.fotozap.com/?hmxxh_81266 [Broken]
27. ### Center of Mass

Here is an easy way to think about it. Cut the circle out of the remaining 3 quarters of the large square, now you have a symmetrical shape about both x and y axis. The center of mass is the center, so we can now ignore this part. Now what is the center of mass of the 3 circles?
28. ### PF Member Photo Thread Archive

Here I am chillin and relaxing ( chillaxin) with my dog. Taken about 2 and a half years ago. http://home.earthlink.net/~avp/smokedawg.jpg [Broken] http://home.earthlink.net/~avp/chokedawg.jpg [Broken] The vampire Monique is nice, but the pirate one is really funny!
29. ### The fastest saturn

79 Corolla is a great beater car. Got mine for $1, sold it for$50!
30. ### G.warming: something to wobble about

1 km3 of water would weigh roughly 1012 kg, and depending on the density of the ice, would be about 93% of that.
31. ### First post. Hello, my name is Davin. Questions.

scott_sieger , There's a place for people like you, it's called sciforums.com
32. ### Can you manufacture water

In oxygen, yes.Could you not also "burn" hydrogen in Fluorine or Chlorine?
33. ### We broke the record!

Oh what a relief compared to sciforums!
34. ### Can you manufacture water

You can also say that you yourself manufacture water during respiration
35. ### Integral of a product.

Okay, so we have the tabular method, where [inte]vdu zero's out and we arrive at the the answer. Is there a name for the other case of IBP, where we will end up with some value 2([inte]udv)=(some known value ) ?
36. ### On Saturday I was taking balloons to my neice for her birthday party

This is the same principle, the lighter air would go torwards the ouside and the heavier sand torwards the inside.
37. ### Infrared waves and heat

Yes, and the equation works for the wavelength of maximum emission.
38. ### How to perform factorial operation

Oops, my bad. I've looked at the mathworld site, many time actually. It turns out this problem stems back a few years, and I just realized its not factorial I'm actually wondering about (tried it on my TI-89) Okay, here is there real problem then. My calculator will give sums for...
39. ### How to perform factorial operation

I don't know if this is the right place for this question, but here it goes. Could someone explain how I would go about solving for x of x=(5/6)! Thanks
40. ### New to physics need a lil help

try Hyper Physics its the bomb.
41. ### Who's your favorite Physicist?

I'll have to stick up for my main man, who is most commonly over looked: Tesla
42. ### Nagging problems

NaSO4 dissociates 4 times, so you get 4 times the hydronium ions when it completely dissociates as compared to HCl edit: ummmmm- this was late at night, and I don't know what I was thinking.
43. ### Vectors help?

A negative magnitude? I'm sorry but I didnt understand your question very well.

wow! nice.
45. ### Derivatives and SA

Damn you all, that's all I can ever think about when I'm painting!
46. ### Attn: chi meson re. explination of bose-Einstein condensation

Cool Chroot and Chi Meson ! Now does one of you want to take a stab at this ?
47. ### New Staff

LOL! NO RUNNING!
48. ### New Staff

welcome! Hey Greg, maybe you could make me a PF Hall Monitor ?
49. ### Ice Force

Looking at one of these should help you: http://wine1.sb.fsu.edu/chm1045/notes/Forces/Phase/h2ophase.gif http://wine1.sb.fsu.edu/chm1045/notes/Forces/Phase/Forces06.htm Not the best page, but its a start.
50. ### Problem with Vectors

1) What is the magnitude of a? use the Pythagorean theorem. since you are given the vectors in component form, we have a right triangle and the magnitude is the hypotenuse [squ](7.42+6.92) 2. given x and y, we know tangent. tan b = by /bx so arctan(y/x)=angle and look to see...